﻿//////////////////////////////////////////////////////////////////////////////
//
// Copyright © 1998-2024 Glodon Company Limited.
//
// Licensed under the MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the “Software”),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
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//////////////////////////////////////////////////////////////////////////////

#pragma once

#include <algorithm>

#include "ExprParser.h"

namespace gcmp
{
    /// \brief 自定义表达式 引擎
    class ExprCustomEngine : public IExprEngine
    {
        struct FuncNameCmp
        {
            bool operator () (const std::wstring& name1, const std::wstring& name2) const;
        };

    public:
        ExprCustomEngine();
        ~ExprCustomEngine();

        std::map<std::wstring, gcmp::OwnerPtr<IExprParser> >::iterator beginParser() { return m_pExprPaserContainer.begin(); }
        std::map<std::wstring, gcmp::OwnerPtr<IExprParser> >::iterator endParser() { return m_pExprPaserContainer.end(); }

        gcmp::OwnerPtr<IExprParser> CreateParser() override;

        void SetNodeDataProvider(gcmp::OwnerPtr<IExprNodeDataProvider> pDataProvider) override;
        IExprNodeDataProvider* GetNodeDataProvider() override;

        bool RegisterExprParser(const wchar_t* pExprParserName, gcmp::OwnerPtr<IExprParser> pNewExprParser) override;
        bool UnRegisterExprParser(const wchar_t* pExprParserName) override;
        IExprParser* FindParser(const wchar_t* pExprParserName) override;

        void RegisterFunction(IExprCustomFunction* aFunction) override;
        void UnRegisterFunction(IExprCustomFunction* aFunction) override;
        IExprCustomFunction* FindFunction(const wchar_t* aName) override;
        IExprCustomFunction* FindFunctionAndAdjustName(wchar_t* aName) override;

    private:
        void Init();

    private:
        std::map<std::wstring, IExprCustomFunction*, FuncNameCmp> m_pFunctionContainer;
        std::map<std::wstring, gcmp::OwnerPtr<IExprParser> > m_pExprPaserContainer;

        gcmp::OwnerPtr<IExprNodeDataProvider> m_pDataProvider;
    };
}
